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Debt: - New Debt Issuances and Debt Exchanges (Details) - USD ($)			1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 02, 2018	Nov. 08, 2017	Dec. 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Nov. 30, 2017	Feb. 27, 2017
Debt Instrument [Line Items]
Consent fees including arrangement, legal and third-party fees	$ 18,400,000
Net gain (loss) on early extinguishment of debt	190,300,000				$ 190,300,000	$ 0	$ 190,300,000	$ (56,400,000)
Net principal reduction	226,000,000.0
Write-off of original issue net discount on debt subject to compromise	35,700,000					27,100,000
Interest expense	6,500,000
Consent fees payable	11,900,000								$ 8,800,000
Fee amount related to debt instrument				$ 27,700,000			27,700,000
Consent fees payables to lenders				6,000,000.0			6,000,000.0
Arrangement, legal, and other fees				21,700,000			21,700,000
Premium on exchanges of debt			$ 95,100,000
Premium on exchanges related to debt modification accounting			45,200,000
Total interest expense			13,800,000			$ 331,900,000	901,300,000	875,400,000
Discount (Premium) on early redemption							226,000,000.0	$ (62,900,000)
2024 Notes – 8.750%, due December 15, 2024
Debt Instrument [Line Items]
Principal amount of debt	414,900,000
Leverage ratio under covenant						3.50
2021 Notes – 7.750%, due October 1, 2021
Debt Instrument [Line Items]
Principal amount of debt	18,800,000
2024 Notes - 8.750% due December 15, 2024
Debt Instrument [Line Items]
Principal amount of debt	578,600,000
Senior First Lien Notes – 8.625%, due October 31, 2025
Debt Instrument [Line Items]
Interest rate, percentage									8.625%
2022 Notes – 7.500%, due June 1, 2022
Debt Instrument [Line Items]
Principal amount of debt	5,300,000
2023 Notes – 7.500%, due April 1, 2023
Debt Instrument [Line Items]
Principal amount of debt	86,000,000.0
2023 Notes – 6.375%, due August 1, 2023
Debt Instrument [Line Items]
Principal amount of debt	340,700,000
Notes 2020
Debt Instrument [Line Items]
Principal amount of debt	$ 414,900,000
Unsecured Debt \| New 2024 Notes
Debt Instrument [Line Items]
Interest rate, percentage	10.50%					10.50%
Unsecured Debt \| 2024 Notes – 8.750%, due December 15, 2024
Debt Instrument [Line Items]
Interest rate, percentage						8.75%
Principal amount of debt				834,300,000			834,300,000
2019				150,000,000.0			150,000,000.0
Unsecured Debt \| 2021 Notes – 7.750%, due October 1, 2021
Debt Instrument [Line Items]
Interest rate, percentage						7.75%
Repayments of debt			539,200,000
Unsecured Debt \| Senior Second Lien Notes – 9.000%, due June 30, 2025
Debt Instrument [Line Items]
Principal amount of debt	$ 802,000,000.0
Interest rate, percentage	9.00%					9.00%
Unsecured Debt \| Senior First Lien Notes – 8.625%, due October 31, 2025
Debt Instrument [Line Items]
Interest rate, percentage						8.625%
Principal amount of debt										$ 200,000,000.0
Unsecured Debt \| 2022 Notes – 7.500%, due June 1, 2022
Debt Instrument [Line Items]
Principal amount of debt										167,500,000
Interest rate, percentage						7.50%
Repayments of debt			232,100,000
Unsecured Debt \| 2023 Notes – 7.500%, due April 1, 2023
Debt Instrument [Line Items]
Principal amount of debt										223,100,000
Interest rate, percentage						7.50%
Unsecured Debt \| 2023 Notes – 6.375%, due August 1, 2023
Debt Instrument [Line Items]
Principal amount of debt										141,300,000
Interest rate, percentage						6.375%
Principal amount of debt										561,900,000
Unsecured Debt \| Notes 2020
Debt Instrument [Line Items]
Interest rate, percentage						7.75%
Repayments of debt						$ 45,300,000
Repurchased debt instrument face amount				49,100,000			49,100,000
Unamortized discount (premium) and debt issuance costs				300,000			300,000
Unsecured Debt \| Exchanges of 2021, 2022, April 2023, August 2023 and 2024 Notes
Debt Instrument [Line Items]
Net gain (loss) on early extinguishment of debt			$ (55,500,000)				190,300,000
Discount (Premium) on early redemption							$ 226,000,000.0
Senior Lien [Member] \| Senior First Lien Notes – 8.625%, due October 31, 2025
Debt Instrument [Line Items]
Interest rate, percentage		8.625%
Principal amount of debt		$ 400,000,000.0
Senior note, new borrowings, issuance percentage		99.00%
New borrowings yield percentage		8.802%
Senior Lien [Member] \| Tranche B6 Notes 2021
Debt Instrument [Line Items]
Repayments of debt				$ 139,000,000.0
Senior secured credit facility \| 2024 Notes – 8.750%, due December 15, 2024
Debt Instrument [Line Items]
Interest rate, percentage	8.75%			8.75%			8.75%
Senior secured credit facility \| 2021 Notes – 7.750%, due October 1, 2021
Debt Instrument [Line Items]
Interest rate, percentage	7.75%
Senior secured credit facility \| 2022 Notes – 7.500%, due June 1, 2022
Debt Instrument [Line Items]
Interest rate, percentage	7.50%
Senior secured credit facility \| 2023 Notes – 7.500%, due April 1, 2023
Debt Instrument [Line Items]
Interest rate, percentage	7.50%
Senior secured credit facility \| 2023 Notes – 6.375%, due August 1, 2023
Debt Instrument [Line Items]
Interest rate, percentage	6.375%
Senior secured credit facility \| Notes 2020
Debt Instrument [Line Items]
Interest rate, percentage	7.75%
Secured Debt \| EarthLink 2020 Notes
Debt Instrument [Line Items]
Interest rate, percentage											7.375%
Secured Debt \| EarthLink 2019 Notes
Debt Instrument [Line Items]
Interest rate, percentage											8.875%
Secured Debt \| Tranche B6 Notes 2021
Debt Instrument [Line Items]
Senior secured credit facilities, new borrowings											$ 450,000,000.0
Interest rate, percentage						10.50%
Line of Credit \| Revolving Line of Credit, Due 2020
Debt Instrument [Line Items]
Interest rate, percentage						8.50%
Repayments of lines of credit						$ 370,000,000.0
Line of Credit \| Senior secured credit facility, Revolving line of credit – variable rates, due April 24, 2020 (b)
Debt Instrument [Line Items]
Repayments of lines of credit		$ 250,000,000.0
Maximum
Debt Instrument [Line Items]
Consent fees including arrangement, legal and third-party fees									$ 2,700,000
Maximum \| Line of Credit \| Revolving Line of Credit, Due 2020
Debt Instrument [Line Items]
Interest rate, percentage				6.50%		8.50%	6.50%
Minimum \| Line of Credit \| Revolving Line of Credit, Due 2020
Debt Instrument [Line Items]
Interest rate, percentage				3.40%		4.38%	3.40%
Notes 2022 \| Unsecured Debt \| 2023 Notes – 6.375%, due August 1, 2023
Debt Instrument [Line Items]
Principal amount of debt										420,600,000
2021 Notes – 7.750%, due October 1, 2021 \| Unsecured Debt \| 2021 Notes – 7.750%, due October 1, 2021
Debt Instrument [Line Items]
Principal amount of debt										181,200,000
2021 Notes – 7.750%, due October 1, 2021 \| Unsecured Debt \| Senior First Lien Notes – 8.625%, due October 31, 2025
Debt Instrument [Line Items]
Principal amount of debt										50,000,000.0
Notes 2020 \| Unsecured Debt \| Senior First Lien Notes – 8.625%, due October 31, 2025
Debt Instrument [Line Items]
Principal amount of debt										150,000,000.0
Notes 2020 \| Unsecured Debt \| Notes 2020
Debt Instrument [Line Items]
Principal amount of debt										$ 158,000,000.0
Debt Modification Accounting
Debt Instrument [Line Items]
Debt issuance costs				$ 4,000,000.0			$ 4,000,000.0
Extinguishment Method Of Accounting
Debt Instrument [Line Items]
Debt issuance costs				$ 7,900,000			$ 7,900,000